F-SF Specifications and Selection for Temperature and Pressure Protection of Water Heaters and Hot Water Storage Tanks NEWS The following will enable you to select the proper size Watts Temperature and Pressure Relief Valves for water heaters, based on the listed temperature relieving capacity exceeding that of the heater BTU input rating. All valves are constructed, tested and rated under ANSI Z21.22 “Relief Valves for Hot Water Supply Systems” and have a discharge capacity based on temperature steam ratings. For Heaters Under 200,000 BTU Per Hour Input Rating: Type No. † Model Inlet x Outlet Size (In.) CSA Temp. Steam Rating BTU/HR 1L-2 1XL-4 1XL-8 M7 M7 M7 12 12 15,000 15,000 15,000 } 10L-2 100XL 100XL-8 M7 M7 M7 34 ⁄ M x 3⁄ 4 F 3 ⁄ 4 M x 3⁄ 4 F 3⁄ 4 M x 3⁄ 4 F 80,000 100,000 100,000 SL100XL L100XL-3 LL100XL-2.5 LLL100XL M7 M7 M7 M7 34 ⁄ M x 3⁄ 4 F ⁄ M x 3⁄ 4 F 3 ⁄ 4 M x 3⁄ 4 F 3⁄ 4 M x 3⁄ 4 F 100,000 100,000 100,000 100,000 40L-3 LL40XL LLL40XL 40XL-5 40XL-8 M15 M15 M15 M15 M15 34 180,000 200,000 200,000 200,000 200,000 140S-3 140X-5 140X-8 M15 M15 M15 } ⁄ M x 1⁄ 2 F ⁄ M x 1⁄ 2 F 1 ⁄ 2 M x 1⁄ 2 F 34 ⁄ M x 3⁄ 4 F ⁄ M x 3⁄ 4 F 3⁄ 4 M x 3⁄ 4 F 3⁄ 4 M x 3⁄ 4 F 3⁄ 4 M x 3⁄ 4 F 34 34 34 ⁄ F x 3⁄ 4 F ⁄ F x 3⁄ 4 F 3 ⁄ 4 F x 3⁄ 4 F 180,000 200,000 200,000 1⁄2" CSA Ratings Must be Used for 1⁄2" & 3⁄4" T&P Valves 3⁄4" †Suffix = length of thermostat in inches. Example: IL-2 = extension length 2". For Heaters Over 200,000 BTU Per Hour Input Rating: 40L-2 40XL-4 40XL-7 LL40XL M15 M15 M15 M15 1Mx1F 1Mx1F 1Mx1F 1Mx1F 450,000 500,000 500,000 500,000 140S-3 140X-6 140X-9 M15 M15 M15 1Fx1F 1Fx1F 1Fx1F 570,000 670,000 670,000 *N240X-6 *N240X-9 *N241X-5 *N241X-8 M15 M15 M15 M15 1Fx1F 1Fx1F 1 1⁄ 4 M x 1 F 1 1⁄ 4 M x 1 F 730,000 730,000 730,000 730,000 *340-3 *340X-8 M15 M15 11⁄2 F x 11⁄2 F 11⁄2 F x 11⁄2 F 1,150,000 1,150,000 *342-3 *342X-8 M15 M15 2 M x 1 1⁄ 2 F 2 M x 1 1⁄ 2 F 1,150,000 1,150,000 *Standardly furnished with stainless steel thermostat tube. These ratings are the result of improved and advanced designs incorporating new higher lift thermostatic elements as well as the ANSI Z21.22 Listing Requirements. See back page for ASME ratings of T&P Valves 1" & larger Valve Specifications to Meet All Latest Applicable Standards and Established Requirements To meet CSA, UL, or FHA water heater standard safety requirements, a temperature and pressure relief valve, constructed and located in conformance with current "ANSI Z21.22 Relief Valves for Hot Water Supply Systems”, shall be installed on all water heaters at time of installation. The temperature sensing element shall be immersed in the water within the top 6” of the tank. CSA Interpretation of Current ANSI Z21.10.1 Gas Storage Water Heater Standard: "That portion of the marking which provides, ‘a listed temperature and pressure relief valve shall be installed at the time of the installation of the heater,’ shall be considered by the CSA to be mandatory and not optional with the installer.” “Compliance with this instruction is deemed by CSA to be a required step for the safe installation and use of a water heater as intended by Z21.10.1 1966. Watts ⁄ " 100XL 34 UL Standards require the following heater marking: “Install temperature and pressure protective equipment required by local codes, but not less than a combination temperature and pressure relief valve certified as meeting requirements of ANSI Z21.22 by a nationally recognized testing laboratory that maintains periodic inspection of production of listed equipment or materials.” FHA No. 300 Minimum Property Standards Sec. 1005-4.1 All direct-fired, automatic storage-type water heaters shall be provided, at the time of installation, with a reseating type temperature and pressure relief valve constructed, listed and installed in accordance with ANSI Z21.22. This requirement is in addition to the energy cutoff device installed by the heater manufacturer and which conforms to the labeling requirements of the appropriate CSA and UL standards. Correct Installation of T&P Relief Valves Use short or standard length thermostat. Vertical discharge line must be installed with its direction downward. Insulation Max. 6" (152mm) Use Standard or extra length extension thermostat Cold T&P Relief Valve Max. 6" (152mm) “Alternate” Only when the tappings are not provided Use Standard or extra length extension thermostat. Hot Max. 6" (152mm) Discharge Line FOR INTERNAL FLUE HEATERS Discharge Line Use extra length extension thermostat to extend into water storage tank. For Heaters with Direct Top Tapping Hot Direct Side Tapping FOR EXTERNAL FLUE HEATERS Insulation Insulation Discharge Line Vertical discharge line must be installed with its direction downward. IMPORTANT A relief valve functions, in an emergency, by discharging water. Therefore, it is essential that a discharge line be piped from the valve in order to carry the overflow to a safe place of disposal. The drain pipe must be the same size as the valve outlet, and must pitch downward from the valve and terminate at least 6” above a drain where discharge will be clearly visible. T&P Relief Valve Ratings CSA Temperature Steam Rating (See Page 1) ASME Pressure Steam Rating (See Page 4) Temperature Water Rating (See Page 4) General Recommendations 1. For gas, electric or oil storage water heaters Watts 3⁄4" 40XL 34 ⁄ " and 1" Series 40, 3⁄4" Series 140, Model M15, 1L-2, 1XL Series and Series 100XL feature a thermostat with a special thermobonded (nonmetalic) protective coating. This feature retards the accumulation of mineral deposits created by adverse water conditions. Thermo-Bonded (non-Metallic) Coating 3. NOTE - Temperature Water Rating at 210°F: Where the BTU heater input exceeds available CSA test ratings, larger size valves 1" and above have an in built temperature water rating capacity at 210°F, as shown on rear page. However, the stated temperature water rating should only be used where approved and understood to be conditional that there must be no less than 30 lbs. supply pressure available to the water heater during any period of overheating discharge. Otherwise, the valves would not be responsible for adequate protection of heater BTU input installations in excess of the CSA temperature steam ratings. WARNING: Following installation, the valve lever MUST be operated AT LEAST ONCE A YEAR by the water heater owner to ensure that waterways are clear. Certain naturally occurring mineral deposits may adhere to the valve, blocking waterways, rendering it inoperative. When the lever is operated, hot water will discharge if the waterways are clear. PRECAUTIONS MUST BE TAKEN TO AVOID PERSONAL INJURY FROM CONTACT WITH HOT WATER AND TO AVOID PROPERTY DAMAGE. BEFORE operating lever, check to see that a discharge line is connected to the valve, directing the flow of hot water from the valve to a proper place of disposal. If no water flows when the lever is operated, replacement of the valve is required. TURN THE WATER HEATER "OFF" (see instruction manual) AND CALL A PLUMBER IMMEDIATELY. This device is designed for emergency safety relief and shall not be used as an operating control. A relief valve functions, in an emergency, by discharging water. Therefore, it is essential that a discharge line be piped from the valve in order to carry the overflow to a safe place of disposal. The discharge line must be same size as the valve outlet and must pitch downward from the valve and terminate at least 6” above a drain where any discharge will be clearly visible. WARNING: REINSPECTION OF T&P RELIEF VALVES: Temperature and Pressure Relief Valves should be inspected AT LEAST ONCE EVERY THREE YEARS, and replaced, if necessary, by a licensed plumbing contractor or qualified service technician, to ensure that the product has not been affected by corrosive water conditions and to ensure that the valve and discharge line have not been altered or tampered with illegally. Certain naturally occurring conditions may corrode the valve or its components over time, rendering the valve inoperative. Such conditions can only be detected if the valve and its components are physically removed and inspected. Do not attempt to conduct an inspection on your own. Contact your plumbing contractor for a reinspection to assure continuing safety. WARNING: FAILURE TO REINSPECT THIS VALVE AS DIRECTED COULD RESULT IN UNSAFE TEMPERATURE OR PRESSURE BUILDUP WHICH CAN RESULT IN SERIOUS INJURY OR DEATH AND/OR SEVERE PROPERTY DAMAGE. Watts 3⁄4" 140XL Stainless Steel Thermostat Tube 2. under 200,000 BTU/hr. rating and for compliance with any applicable water heater labeling requirements: Use 3⁄4" T&P Valves tested under ANSI Z21.22 with ratings as certified and listed by CSA. For gas or oil-fired storage water heaters between 200,000 and 730,000 BTU/hr. rating; and for compliance with any applicable water heater labeling requirements: Use 1" and over T&P valves tested under ANSI Z21.22 with ratings as certified and listed by CSA. For ASME installations of gas or oil-fired hot water supply boilers heating domestic water for a storage tank over 730,000 BTU output; and for ASME installations of steam coil storage water heaters: Use 11⁄2" and over, T&P valves tested under ANSI Z21.22 with ratings as certified and listed by CSA. 1" Series 140 Model M15, Series N240, N241 Model M2 and Series 340, 342 Model M15 are standardly furnished with stainless steel thermostat tube. ▼ The use of a temperature water rating discharge capacity for 1” and larger inlet and outlet T&P relief valves is specified in ANSI Z21.22. Therefore, Watts certifies these 1” and larger valves also have a temperature water rating based on 1,250 BTU for each gallon of water discharged at 30 lbs. working pressure with a maximum temperature of 210°F. They are ASME pressure steam rated at least equal to their temperature water rating as indicated in the specifications following: Type No. IMPORTANT NOTE - Watts Temperature Water Rating 210°F: The stated temperature water rating should only be used where approved and understood to be conditional that there must be no less than 30 lbs. supply pressure available to the water heater. Otherwise, the valves would not be responsible for adequate protection of heater BTU input installations in excess of the CSA temperature steam ratings given on page 1 of this folder. These ratings may be used for T&P valves 1” and larger. See note. Watts Temp. Water Rating 210°F @75 psi set pressure †ASME Pressure Steam Rating †ASME Pressure Steam Rating †ASME Pressure Steam Rating †ASME Pressure Steam Rating Model Inlet x Outlet Size (In.) 40L-2 40XL-4 40XL-7 LL40XL M15 M15 M15 M15 1Mx1F 1Mx1F 1Mx1F 1M x 1F 800,000 1,000,000 1,000,000 1,000,000 1,155,000 1,155,000 1,155,000 1,155,000 1,481,000 1,481,000 1,481,000 1,481,000 1,808,000 1,808,000 1,808,000 1,808,000 2,134,000 2,134,000 2,134,000 2,134,000 *140S-3 *140X-6 *140X-9 M15 M15 M15 1Fx1F 1Fx1F 1Fx1F 1,200,000 1,500,000 1,500,000 1,670,000 1,670,000 1,670,000 2,140 000 2,140,000 2,140,000 2,610,000 2,610,000 2,610,000 3,085,000 3,085,000 3,085,000 *N240X-6 *N240X-9 M15 M15 1Fx1F 1Fx1F 2,000,000 2,000,000 2,195,000 2,195,000 2,817,000 2,817,000 3,438,000 3,438,000 4,059,000 4,059,000 *N241X-5 *N241X-8 M15 M15 1 1⁄ 4 M x 1 F 1 1⁄ 4 M x 1 F 2,000,000 2,000,000 2,195,000 2,195,000 2,817,000 2,817,000 3,438,000 3,438,000 4,059,000 4,059,000 *340-3 *340X-8 M15 M15 1 1⁄ 2 F x 1 1⁄ 2 F 1 1⁄ 2 F x 1 1⁄ 2 F 3,000,000 3,000,000 3,450,000 3,450,000 4,426,000 4,426,000 5,403,000 5,403,000 6,379,000 6,379,000 *342-3 *342X-8 M15 M15 2 M x 1 1⁄ 2 F 2 M x 1 1⁄ 2 F 3,000,000 3,000,000 3,450,000 3,450,000 4,426,000 4,426,000 5,403,000 5,403,000 6,379,000 6,379,000 @100 psi set pressure @125 psi set pressure @150 psi set pressure *Standardly furnished with stainless steel thermostat tube. †These ASME capacities are steam pressure ratings, and do not reflect the CSA temperature relieving capacity of the valves for selection purposes. Watts 3⁄4" No. 140S or 140X Watts 3⁄4” 40L Watts 3⁄4” 40XL Watts 3⁄4” 10L Watts 3⁄4” 100XL Watts 1" 40L or 40XL Watts 1" 140S or 140X Watts 1" N240X Watts 11⁄4" N241X Watts 11⁄2" 340 USA: 815 Chestnut St., No. Andover, MA 01845-6098; www.wattsreg.com Canada: 5435 North Service Rd., Burlington, ONT. L7L 5H7; www.wattscda.com F-SF-0022 ©Watts Regulator Co., 1996 Printed in U.S.A.